Code Definition

P0730 — Incorrect Gear Ratio

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0730

P0730 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0730 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0730 code is set when the Engine Control Module (ECM) or Transmission Control Module (TCM) detects an incorrect gear ratio during the operation of the vehicle's transmission. This fault indicates that the actual gear ratio in use does not match the expected ratio as determined by the ECM/TCM based on input from various sensors. The discrepancy can be due to mechanical issues within the transmission (such as slipping clutches or worn gears), problems with the transmission's electronic controls (like solenoids or sensors), or issues with the transmission fluid (level, condition). Incorrect ...

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